JP2006208582A - Backlight for illumination sign and illumination sign using same - Google Patents

Backlight for illumination sign and illumination sign using same Download PDF

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JP2006208582A
JP2006208582A JP2005018413A JP2005018413A JP2006208582A JP 2006208582 A JP2006208582 A JP 2006208582A JP 2005018413 A JP2005018413 A JP 2005018413A JP 2005018413 A JP2005018413 A JP 2005018413A JP 2006208582 A JP2006208582 A JP 2006208582A
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light
guide plate
backlight
light guide
signboard
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JP4771706B2 (en
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Nobutaka Fujioka
信孝 藤岡
Toshio Kako
敏夫 加固
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Kimoto Co Ltd
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Kimoto Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a backlight for an illumination sign where thickness of the illumination sign in which an image can be observed from both sides is made thin. <P>SOLUTION: At least one side edge section is set to be a light incident face and both side faces which are approximately orthogonal to this are set to be light emitting faces. The backlight for the illumination sign is composed of a light guide plate 11 with 2% or more of haze (JIS K7136:2000) and a light source 12 which is arranged on at least one side edge section of the light guide plate 11. It is desirable that the circumference of the light source 12 is covered with a reflective film 13 and side edge sections other than the light source 12 of the light guide plate 11 are covered with a reflective tape 14. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、電飾看板用バックライト、およびそれを用いた電飾看板に関し、両面用でありながら薄型であるものに関する。   TECHNICAL FIELD The present invention relates to a backlight for an electric signboard and an electric signboard using the same, and relates to a backlight that is thin while being for both sides.

従来、画像が印刷などされてなる画像層を照明して表示する電飾看板は、たとえば図4に示されるように、ハウジング内に蛍光灯を数本配列し、蛍光灯の上方に配置された画像層を照明する構造になっている。   2. Description of the Related Art Conventionally, an electric signboard that illuminates and displays an image layer on which an image is printed or the like is arranged above a fluorescent lamp by arranging several fluorescent lamps in a housing, for example, as shown in FIG. It is structured to illuminate the image layer.

このような構造の電飾看板は、蛍光灯の形が浮き出てしまうことを防止するために、蛍光灯と画像層との間隔を15〜20cm程度離す必要があり、厚みが厚くなってしまうという欠点がある。特に、近年は両面から画像を観察することが求められる場合があり、蛍光灯と両面の画像層との間隔を離した場合、より一層厚くなってしまう。   In order to prevent the shape of the fluorescent lamp from popping up, the electric signboard having such a structure needs to have a distance of about 15 to 20 cm between the fluorescent lamp and the image layer, which increases the thickness. There are drawbacks. In particular, in recent years, it may be required to observe images from both sides, and when the distance between the fluorescent lamp and the image layers on both sides is increased, the thickness becomes even thicker.

そこで、両面から画像を観察できるとともに、厚みを薄くすることを解決するものとして、図5のように、導光板どうしを背中合わせとし、背中合わせとした導光板の間に反射フィルムを挟みこみ、背中合わせとした導光板の側端部に光源を配置してなるバックライトを使用した電飾看板が提案されている(特許文献1)。この電飾看板は、光源を側端部に配置できるため、従来の電飾看板より厚みを薄くできるものである。   Therefore, the image can be observed from both sides, and as a solution to reducing the thickness, as shown in FIG. 5, the light guide plates are back-to-back, and a reflective film is sandwiched between the back-to-back light guide plates. There has been proposed an electric signboard using a backlight in which a light source is arranged on a side end portion of a light guide plate (Patent Document 1). Since this electric signboard can arrange | position a light source in a side edge part, thickness can be made thinner than the conventional electric signboard.

特開2004−13072号公報(特許請求の範囲、図3)Japanese Patent Laying-Open No. 2004-13072 (Claims, FIG. 3)

しかし、このような特許文献1の電飾看板においても厚みが厚く、さらに厚みを薄くした電飾看板が求められていた。   However, such an electric signboard of Patent Document 1 is also thick, and an electric signboard with a further reduced thickness has been demanded.

上記課題を解決する本発明の電飾看板用バックライトは、少なくとも一つの側端部を光入射面とし、これと略直交する両側の面を光出射面とする、ヘーズ(JIS K7136:2000)が2%以上の導光板と、前記導光板の少なくとも一つの側端部に配置された光源とからなることを特徴とするものである。   The backlight for an electric signboard according to the present invention that solves the above-described problems has a haze (JIS K7136: 2000) in which at least one side end portion is a light incident surface, and both surfaces substantially orthogonal to the light incident surface are light emission surfaces. Is composed of a light guide plate of 2% or more and a light source disposed at at least one side end of the light guide plate.

好ましくは、少なくとも一つの側端部を光入射面とし、これと略直交する両側の面を光出射面とする、ヘーズ(JIS K7136:2000)が10〜40%の導光板と、前記導光板の両側の面上に接するようにして配置されてなるヘーズが70%以上の光拡散性シートと、前記導光板の少なくとも一つの側端部に配置された光源とからなることを特徴とするものである。   Preferably, a light guide plate having a haze (JIS K7136: 2000) of 10 to 40%, wherein at least one side end portion is a light incident surface, and both surfaces substantially orthogonal to the light incident surface are light emission surfaces, and the light guide plate A light diffusing sheet having a haze of 70% or more disposed so as to be in contact with both sides of the light source and a light source disposed on at least one side end of the light guide plate It is.

このような電飾看板用バックライトによれば、両面から画像を観察できる電飾看板の厚みを薄くすることが可能である。   According to such a backlight for an electric signboard, it is possible to reduce the thickness of the electric signboard from which images can be observed from both sides.

また、本発明の電飾看板は、バックライトと、前記バックライトの両側の面上に配置された画像層とからなる電飾看板において、前記バックライトとして、上記バックライトを用いてなることを特徴とするものである。   Moreover, the electric signboard of the present invention is an electric signboard consisting of a backlight and image layers arranged on both sides of the backlight, and the backlight is used as the backlight. It is a feature.

本発明の電飾看板用バックライトは、両側の面を光出射面とする、ヘーズ(JIS K7136:2000)が2%以上の導光板を用いてなることから、バックライトの厚みが薄く、電飾看板とした際の厚みを薄くすることができる。また、特に、導光板のヘーズを10〜40%とし、導光板の両側の面上に、ヘーズが70%以上の光拡散性シートを配置してなるバックライトとすることにより、厚みを薄くしつつ、全体の輝度を均一に高くすることができる。また、本発明の電飾看板用バックライトを用いてなる本発明の電飾看板は、厚みを極めて薄くすることができる。   The backlight for an electric signboard according to the present invention uses a light guide plate having a light emitting surface on both sides and having a haze (JIS K7136: 2000) of 2% or more. The thickness when used as a decorative signboard can be reduced. In particular, the thickness of the light guide plate is reduced by setting the light guide plate to have a haze of 10 to 40% and a light diffusing sheet having a haze of 70% or more on both sides of the light guide plate. However, the overall luminance can be increased uniformly. Moreover, the electric signboard of the present invention using the backlight for the electric signboard of the present invention can be made extremely thin.

まず、本発明の電飾看板用バックライトについて説明する。   First, the backlight for an electric signboard of the present invention will be described.

本発明の電飾看板用バックライトは、少なくとも一つの側端部を光入射面とし、これと略直交する両側の面を光出射面とする、ヘーズ(JIS K7136:2000)が2%以上の導光板と、前記導光板の少なくとも一つの側端部に配置された光源とからなることを特徴とするものである。以下、本発明の電飾看板用バックライトの実施の形態について説明する。   The backlight for an electric signboard according to the present invention has at least one side end as a light incident surface and light exit surfaces on both sides substantially perpendicular to the light incident surface, and the haze (JIS K7136: 2000) is 2% or more. It comprises a light guide plate and a light source disposed at at least one side end of the light guide plate. Hereinafter, an embodiment of the backlight for an electric signboard of the present invention will be described.

図1、図2は、本発明の電飾看板用バックライト1の実施の形態を示す断面図である。図1の電飾看板用バックライト1は、導光板11、光源12、反射フィルム13、反射テープ14からなり、図2の電飾看板用バックライト1は、さらに光拡散性シート15を備えている。   1 and 2 are sectional views showing an embodiment of a backlight 1 for an electric signboard according to the present invention. 1 includes a light guide plate 11, a light source 12, a reflective film 13, and a reflective tape 14, and the electrical signboard backlight 1 of FIG. 2 further includes a light diffusing sheet 15. Yes.

導光板は、少なくとも一つの側端部を光入射面とし、これと略直交する両側の面を光出射面とする、ヘーズ(JIS K7136:2000)が2%以上、好ましくは10%以上のものを使用する。   The light guide plate has a haze (JIS K7136: 2000) of 2% or more, preferably 10% or more, with at least one side end as a light incident surface and both sides substantially orthogonal to the light emitting surface as light emission surfaces. Is used.

このようなヘーズが全体として均一に2%以上の導光板は、両面から光を出射することができるため、厚みを厚くする原因となる導光板を一枚使用するのみで両面の画像層を照らすことができる。したがって、このような導光板を用いてなる本発明の電飾看板用バックライトは、電飾看板の厚みを極めて薄くすることができる。   A light guide plate having a uniform haze of 2% or more as a whole can emit light from both sides, so that the image layers on both sides are illuminated only by using one light guide plate that causes the thickness to increase. be able to. Therefore, the backlight for an electric signboard of the present invention using such a light guide plate can make the thickness of the electric signboard extremely thin.

一方、従来の電飾看板に使用されている導光板は、導光板の裏面に拡散反射パターンを有するものであり、導光板の裏面に反射フィルムを必要とするものである。したがって、両面の画像層を照らそうとする場合、導光板どうしを背中合わせとし、さらに導光板の間に反射フィルムを挟み込む必要があり、電飾看板の厚みを十分薄くすることができないものであった。   On the other hand, the light guide plate used for the conventional electric signboard has a diffuse reflection pattern on the back surface of the light guide plate, and requires a reflective film on the back surface of the light guide plate. Therefore, when it is intended to illuminate the image layers on both sides, the light guide plates must be back to back and a reflective film must be sandwiched between the light guide plates, and the thickness of the electric signboard cannot be made sufficiently thin.

本発明の電飾看板用バックライトを構成する導光板は、透明樹脂中に光拡散剤を練り込み、これを略平板状に成形することにより得ることができる。   The light guide plate constituting the backlight for the electric signboard of the present invention can be obtained by kneading a light diffusing agent in a transparent resin and molding it into a substantially flat plate shape.

透明樹脂としては、ポリエステル系樹脂、アクリル系樹脂、アクリルウレタン系樹脂、ポリエステルアクリレート系樹脂、ポリウレタンアクリレート系樹脂、エポキシアクリレート系樹脂、ウレタン系樹脂、エポキシ系樹脂、ポリカーボネート系樹脂、セルロース系樹脂、アセタール系樹脂、ポリエチレン系樹脂、ポリスチレン系樹脂、ポリアミド系樹脂、ポリイミド系樹脂、メラミン系樹脂、フェノール系樹脂、シリコーン系樹脂などの熱可塑性樹脂、熱硬化性樹脂、電離放射線硬化性樹脂などがあげられる。これらの中でも光学特性に優れるアクリル系樹脂が好適に使用され、その中でもポリメチルメタクリレート樹脂が特に好適である。   Transparent resins include polyester resins, acrylic resins, acrylic urethane resins, polyester acrylate resins, polyurethane acrylate resins, epoxy acrylate resins, urethane resins, epoxy resins, polycarbonate resins, cellulose resins, and acetals. Resin, polyethylene resin, polystyrene resin, polyamide resin, polyimide resin, melamine resin, phenol resin, silicone resin and other thermoplastic resins, thermosetting resins, ionizing radiation curable resins, etc. . Among these, acrylic resins having excellent optical properties are preferably used, and among them, polymethyl methacrylate resin is particularly preferable.

光拡散剤としては、炭酸カルシウム、炭酸マグネシウム、硫酸バリウム、シリカ、水酸化アルミニウム、カオリン、クレー、タルク等の無機微粒子や、アクリル樹脂粒子、シリコーン樹脂粒子、ポリスチレン樹脂粒子、ポリウレタン樹脂粒子、ポリエチレン樹脂粒子、ベンゾグアナミン樹脂粒子、エポキシ樹脂粒子等の有機微粒子などがあげられる。   As light diffusing agents, inorganic fine particles such as calcium carbonate, magnesium carbonate, barium sulfate, silica, aluminum hydroxide, kaolin, clay, talc, acrylic resin particles, silicone resin particles, polystyrene resin particles, polyurethane resin particles, polyethylene resin Examples thereof include organic fine particles such as particles, benzoguanamine resin particles, and epoxy resin particles.

導光板のヘーズを2%以上としたのは、導光板の光出射面側から十分に光を出射させ、電飾看板とした際の輝度を十分にするためである。なお、導光板のヘーズは、より高くすることによって、光出射面から出射する光をより十分なものとすることができるとともに、表裏の画像層のそれぞれの情報が交錯するのを防止できる程度の隠蔽性が得られる点で好ましい。しかし、導光板を使用した電飾看板では、設置占有面積や費用の問題から、光源を導光板の一方の側のみに設けることが求められている。このように光源を導光板の一方の側にのみ設けた場合、導光板のヘーズを高くしすぎると、光源側の輝度が大きいものの、光源から離れた側の輝度は小さくなるといった輝度差が生じるようになってしまう。そこで、本発明者らはさらに検討した結果、ヘーズが10〜40%、好ましくは20〜40%の導光板の両側の面上に、ヘーズが70%以上の光拡散性シートを接するようにして配置することにより、電飾看板とした際の全体の輝度が十分であり、光源からの距離による輝度差も殆どなく、表裏の情報の交錯を防止できる電飾看板用バックライトの完成に至った。   The reason why the haze of the light guide plate is set to 2% or more is to sufficiently emit light from the light exit surface side of the light guide plate to obtain sufficient brightness when used as an electric decoration signboard. It should be noted that the haze of the light guide plate can be made higher so that the light emitted from the light exit surface can be made more sufficient and the information on the front and back image layers can be prevented from intermingling. It is preferable in terms of obtaining concealability. However, in the electric signboard using the light guide plate, it is required to provide the light source only on one side of the light guide plate due to the problem of installation occupation area and cost. Thus, when the light source is provided only on one side of the light guide plate, if the haze of the light guide plate is increased too much, a luminance difference occurs such that the luminance on the light source side is large but the luminance on the side away from the light source is small. It becomes like this. Therefore, as a result of further investigation, the present inventors have made a light diffusive sheet having a haze of 70% or more in contact with both sides of the light guide plate having a haze of 10 to 40%, preferably 20 to 40%. By arranging it, the overall brightness of the illuminated signboard is sufficient, there is almost no difference in brightness due to the distance from the light source, and the backlight for the illuminated signboard that can prevent the crossing of information on the front and back has been completed. .

導光板のヘーズは、導光板の厚みや導光板中の光拡散剤の添加量により調整することができる。例えば、ヘーズを10〜40%とするには、導光板の厚みを2〜20mmとし、光拡散剤を透明樹脂100重量部に対して0.5×10−5〜0.1重量部含有させればよい。 The haze of the light guide plate can be adjusted by the thickness of the light guide plate and the amount of light diffusing agent added in the light guide plate. For example, in order to set the haze to 10 to 40%, the thickness of the light guide plate is set to 2 to 20 mm, and the light diffusing agent is contained in an amount of 0.5 × 10 −5 to 0.1 parts by weight with respect to 100 parts by weight of the transparent resin. Just do it.

光拡散性シートとしては、透明基材の片面又は両面に透明バインダー樹脂および光拡散剤からなる光拡散層を設けたもの、透明基材の片面又は両面をサンドブラスト処理したものなどがあげられる。   Examples of the light diffusing sheet include those in which a light diffusing layer comprising a transparent binder resin and a light diffusing agent is provided on one or both surfaces of a transparent substrate, and those in which one or both surfaces of a transparent substrate are sandblasted.

透明基材としては、ポリエチレンテレフタレート、ポリカーボネート、ポリプロピレン、ポリエチレン、ポリ塩化ビニル、ポリエチレンナフタレート、ポリスチレン、(メタ)アクリル酸エステル樹脂、フッ素系樹脂などからなる各種の合成樹脂フィルムなどがあげられる。透明基材の厚みは、10〜200μm程度である。光拡散層の透明バインダー樹脂、光拡散剤としては、上述した透明樹脂、光拡散剤を使用することができる。   Examples of the transparent substrate include various synthetic resin films composed of polyethylene terephthalate, polycarbonate, polypropylene, polyethylene, polyvinyl chloride, polyethylene naphthalate, polystyrene, (meth) acrylate resin, fluorine resin, and the like. The thickness of the transparent substrate is about 10 to 200 μm. As the transparent binder resin and light diffusing agent of the light diffusion layer, the above-described transparent resin and light diffusing agent can be used.

光拡散性シートのヘーズを70%以上としたのは、バックライトの輝度を全体的に均一に高くするとともに、電飾看板とした際に表裏の画像層の情報の交錯を防止するためである。なお、極端にヘーズが高いと輝度が損なわれてしまうことがあるため、ヘーズの上限は99%以下であることが好ましい。   The reason why the haze of the light diffusing sheet is set to 70% or more is to increase the luminance of the backlight uniformly as a whole and to prevent the information on the image layers on the front and back sides from being mixed when used as an electric decoration signboard. . In addition, since luminance may be impaired when the haze is extremely high, the upper limit of haze is preferably 99% or less.

光拡散性シートのヘーズは、光拡散層の厚みや光拡散層における光拡散剤の含有量により調整することができる。ヘーズを70%以上とするには、光拡散層の厚みを5〜50μmとし、光拡散層における光拡散剤の含有量を、バインダー樹脂100重量部に対して、50〜300重量部とすればよい。   The haze of the light diffusing sheet can be adjusted by the thickness of the light diffusing layer and the content of the light diffusing agent in the light diffusing layer. In order to make the haze 70% or more, the thickness of the light diffusion layer is 5 to 50 μm, and the content of the light diffusing agent in the light diffusion layer is 50 to 300 parts by weight with respect to 100 parts by weight of the binder resin. Good.

光拡散性シートは、導光板の両側の面上に接するように配置されてなる。導光板上に重ねて置いてもよいし、粘着剤により貼り合わせてもよい。   The light diffusing sheet is arranged so as to be in contact with both surfaces of the light guide plate. They may be placed on the light guide plate, or may be bonded together with an adhesive.

光源は、導光板の少なくとも一側端部に配置される。光源としては、蛍光灯、冷陰極管、LEDが使用される。光源の形状としては、線状、U字状、点状のものなどがあげられる。   The light source is disposed on at least one side end of the light guide plate. As the light source, a fluorescent lamp, a cold cathode tube, and an LED are used. Examples of the shape of the light source include a linear shape, a U shape, and a dot shape.

導光板11の光源12が配置されない側端部は、光もれを防止するため、反射テープ14を貼り合わせておくことが好ましい(図1、図2)。また、光源12の周囲には、光が効率よく導光板11に入射されるように、導光板11側を除いて反射13フィルムを巻きつけておくことが好ましい(図1、図2)。   In order to prevent leakage of light, it is preferable to attach a reflective tape 14 to the side end portion of the light guide plate 11 where the light source 12 is not disposed (FIGS. 1 and 2). Further, it is preferable to wind a reflection 13 film around the light source 12 except for the light guide plate 11 side so that light is efficiently incident on the light guide plate 11 (FIGS. 1 and 2).

次に、本発明の電飾看板について説明する。   Next, the electric signboard of the present invention will be described.

本発明の電飾看板は、バックライトと、前記バックライトの両側の面上に配置された画像層とからなる電飾看板において、前記バックライトとして、上述した本発明のバックライトを用いてなることを特徴とするものである。以下、本発明の電飾看板の実施の形態について説明する。   The electric signboard of the present invention is an electric signboard comprising a backlight and image layers disposed on both sides of the backlight, and the backlight of the present invention described above is used as the backlight. It is characterized by this. Hereinafter, embodiments of the electric signboard of the present invention will be described.

図3は、本発明の電飾看板2の実施の形態を示す断面図である。この電飾看板2は、導光板11、光源12、反射フィルム13、反射テープ14、光拡散性シート15からなる電飾看板用バックライト、および画像層21、アクリル板22、収納ボックス23からなっている。   FIG. 3 is a cross-sectional view showing an embodiment of the electric signboard 2 of the present invention. The electric signboard 2 includes an electric signboard backlight including a light guide plate 11, a light source 12, a reflective film 13, a reflective tape 14, and a light diffusing sheet 15, an image layer 21, an acrylic plate 22, and a storage box 23. ing.

電飾看板用バックライトとしては、上述した本発明のバックライトを使用することができる。   As the backlight for the electric signboard, the backlight of the present invention described above can be used.

画像層は、透明あるいは半透明のフィルム又はシート上に、印刷あるいは、カッティングシートを貼り付けることにより画像を形成してなるものである。また、光拡散性シート上に直接印刷したり、カッティングシートを貼り付けるなどして画像層を形成してもよい。   The image layer is formed by printing or pasting a cutting sheet on a transparent or translucent film or sheet. Further, the image layer may be formed by printing directly on the light diffusive sheet or pasting a cutting sheet.

収納ボックスは光源を収納するためのものであり、光遮断性を有する各種金属などからなる。また、これら収納ボックス内には、光源、導光板、画像層、アクリル板などの他の部材を固定するため、ネジなどの固定手段を備えることが好ましい。   The storage box is for storing a light source and is made of various metals having light blocking properties. Moreover, in order to fix other members, such as a light source, a light-guide plate, an image layer, and an acrylic board, it is preferable to provide fixing means, such as a screw, in these storage boxes.

アクリル板は、画像層を保護するためのものであり、市販のアクリル板を使用することができる。   The acrylic plate is for protecting the image layer, and a commercially available acrylic plate can be used.

以上説明した電飾看板は、ネジなどの固定具を用いて天井などの設置場所に設置することができる。   The electric signboard described above can be installed at an installation location such as a ceiling using a fixture such as a screw.

以下、実施例により本発明を更に説明する。なお、「部」、「%」は特に示さない限り、重量基準とする。   The following examples further illustrate the present invention. “Parts” and “%” are based on weight unless otherwise specified.

[実施例1]
芳香族ポリカーボネート樹脂(パンライトL-1225:帝人化成社、ηSP=0.41)100部に対し、アクリル樹脂粒子(MBX−5:積水化成品工業社)を0.02部混合した後、スクリュー径30mmのベント付一軸押出機(VSK−30:ナカタニ社)により、シリンダー温度280℃で溶融混練し、ストランドカットによりペレットを得、得られたペレットを120℃で5時間熱風循環式乾燥機により乾燥した後、射出成形機によりシリンダー温度280℃、金型温度80℃で成形し、幅1800mm、高さ330mm、厚み4mmの導光板を得た。得られた導光板のヘーズは28.9%であった。
[Example 1]
After mixing 0.02 part of acrylic resin particles (MBX-5: Sekisui Plastics Co., Ltd.) with 100 parts of aromatic polycarbonate resin (Panlite L-1225: Teijin Chemicals, η SP = 0.41), Using a single screw extruder with a screw diameter of 30 mm (VSK-30: Nakatani Co., Ltd.), melt kneading at a cylinder temperature of 280 ° C. to obtain pellets by strand cutting, and the resulting pellets are heated at 120 ° C. for 5 hours with a hot air circulation dryer After drying, the mixture was molded by an injection molding machine at a cylinder temperature of 280 ° C. and a mold temperature of 80 ° C. to obtain a light guide plate having a width of 1800 mm, a height of 330 mm, and a thickness of 4 mm. The haze of the obtained light guide plate was 28.9%.

次いで、導光板の幅広側の一方の側端部に、冷陰極管を配置し、さらに導光板の光入射面以外の側端部を反射テープで覆い、冷陰極管の導光板側以外の周囲を反射フィルムで覆い、実施例1の電飾看板用バックライトを得た。   Next, a cold cathode tube is arranged at one side end of the light guide plate on the wide side, and the side end portion other than the light incident surface of the light guide plate is covered with a reflective tape, and the periphery of the cold cathode tube other than the light guide plate side Was covered with a reflective film to obtain a backlight for an electric signboard of Example 1.

次いで、得られた電飾看板用バックライト上に、透明フィルム上に画像を形成してなる画像層を配置し、実施例1の電飾看板を得た。   Next, an image layer formed by forming an image on a transparent film was placed on the obtained backlight for the electrical signboard, and the electrical signboard of Example 1 was obtained.

[実施例2]
実施例1の電飾看板用バックライトの導光板の両側の面上に、ヘーズ46%の光拡散性シート(ライトアップTL4:きもと社)を直接重ねあわせ、実施例2の電飾看板用バックライトを得た。
[Example 2]
A light diffusing sheet (light up TL4: Kimotosha) with a haze of 46% is directly superimposed on both sides of the light guide plate of the backlight for the electric signboard of Example 1, and the back for the electric signboard of Example 2 Got the light.

次いで、得られた電飾看板用バックライト上に、透明フィルム上に画像を形成してなる画像層を配置し、実施例2の電飾看板を得た。   Next, an image layer formed by forming an image on a transparent film was placed on the obtained backlight for the electrical signboard, and the electrical signboard of Example 2 was obtained.

[実施例3]
実施例1の電飾看板用バックライトの導光板の両側の面上に、ヘーズ88%の光拡散性シート(ライトアップMXE:きもと社、厚み110μm)を直接重ねあわせ、実施例3の電飾看板用バックライトを得た。
[Example 3]
A light diffusing sheet of 88% haze (Light-up MXE: Kimoto Co., thickness 110 μm) is directly superimposed on both sides of the light guide plate of the backlight for the electric signboard of Example 1, and the electric decoration of Example 3 A backlight for a signboard was obtained.

次いで、得られた電飾看板用バックライト上に、透明フィルム上に画像を形成してなる画像層を配置し、実施例3の電飾看板を得た。   Next, an image layer formed by forming an image on a transparent film was placed on the obtained backlight for the electrical signboard, and the electrical signboard of Example 3 was obtained.

[実施例4]
芳香族ポリカーボネート樹脂100部に対し、アクリル樹脂粒子を0.05部混合した以外は、実施例1と同様にして導光板を得た。得られた導光板のヘーズは46.1%であった。
[Example 4]
A light guide plate was obtained in the same manner as in Example 1 except that 0.05 part of acrylic resin particles was mixed with 100 parts of aromatic polycarbonate resin. The haze of the obtained light guide plate was 46.1%.

次いで、導光板の幅広側の一方の側端部に、冷陰極管を1灯配置し、さらに導光板の光入射面以外の側端部を反射テープで覆い、冷陰極管の導光板側以外の周囲を反射フィルムで覆い、実施例4の電飾看板用バックライトを得た。   Next, one cold-cathode tube is disposed on one side of the wide side of the light guide plate, and the side end of the light guide plate other than the light incident surface is covered with a reflective tape, and other than the light guide plate side of the cold cathode tube Was covered with a reflective film to obtain a backlight for an electric signboard of Example 4.

次いで、得られた電飾看板用バックライト上に、透明フィルム上に画像を形成してなる画像層を配置し、実施例4の電飾看板を得た。   Next, an image layer formed by forming an image on a transparent film was placed on the obtained backlight for the electrical signboard, and the electrical signboard of Example 4 was obtained.

実施例1〜4で得られた電飾看板用バックライトは、いずれも導光板1枚のみで両側の面から光出射できるものであり、厚みが4mm程度と薄いものであった。また、これら電飾看板用バックライトを用いてなる実施例1〜4の電飾看板は、厚みが薄いものであった。   The backlights for electric signboards obtained in Examples 1 to 4 were all capable of emitting light from both sides with only one light guide plate, and the thickness was as thin as about 4 mm. Moreover, the electrical signboard of Examples 1-4 which uses these backlights for an electrical signboard was thin.

また、実施例1〜4の電飾看板について、以下の項目について評価を行った。結果を表1に示す。   Moreover, about the electrical decoration signboard of Examples 1-4, the following items were evaluated. The results are shown in Table 1.

(1)画像の隠蔽性
表裏の画像層の画像の交錯について目視で評価を行った。その結果、画像が交錯していないものを「○」、若干交錯しているものを「△」とした。
(1) Concealment of image Visual evaluation was performed on the crossing of the images on the front and back image layers. As a result, “◯” indicates that the images are not mixed, and “Δ” indicates that the images are slightly mixed.

(2)輝度の均一性
光源に近い側と光源から離れた側の輝度の違いを目視で評価を行った。その結果、輝度差がほとんど感じられないものを「○」、輝度差が若干感じられるものを「△」とした。
(2) Uniformity of luminance The difference in luminance between the side closer to the light source and the side away from the light source was visually evaluated. As a result, “◯” indicates that the luminance difference is hardly felt, and “Δ” indicates that the luminance difference is slightly felt.

Figure 2006208582
Figure 2006208582

表1の結果から明らかなように、実施例3の電飾看板は、ヘーズが10〜40%の導光板の両側の面上に、ヘーズが70%以上の光拡散性シートを接するように配置してなる実施例3の電飾看板用バックライトを用いていることから、画像の隠蔽性および輝度の均一性の何れも満足できるものであった。   As is apparent from the results of Table 1, the electrical signboard of Example 3 is arranged so that the light diffusive sheet having a haze of 70% or more is in contact with the surfaces on both sides of the light guide plate having a haze of 10 to 40%. Since the backlight for the electric signboard of Example 3 thus formed was used, both the image concealing property and the luminance uniformity were satisfactory.

本発明の電飾看板用バックライトの一実施例を示す断面図Sectional drawing which shows one Example of the backlight for the electrical signboard of this invention 本発明の電飾看板用バックライトの他の実施例を示す断面図Sectional drawing which shows the other Example of the backlight for the electrical signboards of this invention 本発明の電飾看板の一実施例を示す断面図Sectional drawing which shows one Example of the electrical signboard of this invention 従来の電飾看板の一例を示す断面図Sectional drawing which shows an example of the conventional electrical signboard 従来の電飾看板のほかの例を示す断面図Sectional drawing which shows the other example of the conventional electrical signboard

符号の説明Explanation of symbols

1・・・・電飾看板用バックライト
11・・・導光板
12・・・光源
13・・・反射フィルム
14・・・反射テープ
15・・・光拡散性シート
2・・・・電飾看板
21・・・画像層
22・・・アクリル板
23・・・収納ボックス
24・・・ハウジング
DESCRIPTION OF SYMBOLS 1 ... Backlight for electrical signboard 11 ... Light guide plate 12 ... Light source 13 ... Reflective film 14 ... Reflective tape 15 ... Light diffusive sheet 2 ... Electric signboard 21 ... Image layer 22 ... Acrylic plate 23 ... Storage box 24 ... Housing

Claims (3)

少なくとも一つの側端部を光入射面とし、これと略直交する両側の面を光出射面とする、ヘーズ(JIS K7136:2000)が2%以上の導光板と、前記導光板の少なくとも一つの側端部に配置された光源とからなることを特徴とする電飾看板用バックライト。   A light guide plate having a haze (JIS K7136: 2000) of 2% or more, wherein at least one side end portion is a light incident surface, and both surfaces substantially orthogonal to the light incident surface are light emission surfaces; and at least one of the light guide plates An electrical signboard backlight comprising a light source arranged at a side end. 少なくとも一つの側端部を光入射面とし、これと略直交する両側の面を光出射面とする、ヘーズ(JIS K7136:2000)が10〜40%の導光板と、前記導光板の両側の面上に接するようにして配置されてなるヘーズが70%以上の光拡散性シートと、前記導光板の少なくとも一つの側端部に配置された光源とからなることを特徴とする電飾看板用バックライト。   A light guide plate having a haze (JIS K7136: 2000) of 10 to 40%, wherein at least one side end portion is a light incident surface and both surfaces substantially orthogonal to the light incident surface are light emission surfaces; An electric signboard comprising: a light diffusive sheet having a haze of 70% or more arranged so as to be in contact with the surface; and a light source arranged on at least one side end of the light guide plate. Backlight. バックライトと、前記バックライトの両側の面上に配置された画像層とからなる電飾看板において、前記バックライトとして、請求項1又は2記載のバックライトを用いてなることを特徴とする電飾看板。   An electrical signboard comprising a backlight and image layers arranged on both sides of the backlight, wherein the backlight according to claim 1 or 2 is used as the backlight. Decorative signboard.
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